How do I make a marketplace

How can I make a marketplace where

1) all goods are presented on the front page (global chart, which I have), and

2) the goods can be paid for in a global chart (which seems to be a problem), and

3) I as a marketplace owner can take a cut of each sale.

Based on the advertisement, it seems this should be possible, but I can’t find any info about how to achieve this.

Best regards

Tor B.